The white lens barrel helps to minimize heat haze within the barrel
A super telephoto lens offering a 35mm-equivalent focal length of 859mm. This long reach lens has a maximum aperture of f/5.6 and features a 9 rounded diaphragm blade construction. The optical construction of the lens includes a high-grade multi-layer HD coating on lens elements for sharp, clear imagery with reduced flare and ghosting due to internal reflections. The optical design mimics that of a telescope, and also includes two extra-low dispersion (ED) lens elements to prevent chromatic aberration and maintain image clarity across the entire picture plane. A Super Protect (SP) coating is also applied for increased protection on the front element and for greater ease when cleaning.
A built-in DC driving motor promotes smooth auto focusing, which can also be deactivated using the Quick-Shift focus system to instantly switch between AF and MF modes. A built-in filter holder within the lens barrel permits the use of 40.5mm filters (a circular polarizer is included) for greater accessibility to a variety of filters. Additionally the white lens barrel helps to minimize heat haze within the barrel while a dust and weatherproof construction ensures proper functionality in poor shooting conditions.
Super telephoto-length lens provides a 35mm equivalent focal length of 859mm. Telescope-type optical construction integrates two extra-low dispersion elements to help reduce chromatic aberration. High-grade multi-layer HD coating and SP (Super Protect) coating ensure image fidelity, reduce lens flare, and provide additional protection to the lens elements. AF driving motor (DC motor) produces smooth autofocus operation. Dustproof and weather-resistant design utilizes 29 special seals for increased protection when working in the elements. Built-in 40.5mm drop-in filter holder facilitates easier switching between filters. Autofocus system is compatible with K10D and later Pentax K-mount bodies (manual focus is supported on all K-mount Pentax DSLRs).
Announced Sept 10, 2012.